Coassembly of nanorods and photosensitive binary blends: "combing" with light to create periodically ordered nanocomposites.
Coassembly of nanorods and photosensitive binary blends: "combing" with light to create periodically ordered nanocomposites.
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DOI：
10.1021/la304411w
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发表时间：
2013-01
期刊：
影响因子：
--
通讯作者：
Ya Liu;O. Kuksenok;A. Balazs
中科院分区：
文献类型：
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作者：
Ya Liu;O. Kuksenok;A. Balazs
使用计算建模，我们建立了一种方法，控制结构形成的纳米复合材料，包括纳米棒和光敏二元共混物。在系统中的复杂的合作相互作用包括一个优先润湿的共混物中的相之一，涂覆棒之间的空间排斥，和响应的二元共混物的杆之间的相互作用。在均匀光照下，二元混合物经历相分离和可逆的化学反应，导致类似于微相分离的二嵌段共聚物的形态。当第二个更高强度的光源在样品上光栅扫描时，二元混合物和纳米棒共同组装成规则的、周期性有序的结构。特别是，该系统显示出基本上无缺陷的层状形态，与纳米棒定位在积极有利的域。通过改变二次光在样品上光栅化的速度，我们可以控制混合物内棒的方向对准。我们的方法产生了一个有效的途径，实现形态控制的聚合物组分和纳米粒子，提供了一种手段，定制的性能和最终性能的复合材料。
Using computational modeling, we establish a means of controlling structure formation in nanocomposites that encompass nanorods and a photosensitive binary blend. The complex cooperative interactions in the system include a preferential wetting interaction between the rods and one of the phases in the blend, steric repulsion between the coated rods, and the response of the binary blend to light. Under uniform illumination, the binary mixture undergoes both phase separation and a reversible chemical reaction, leading to a morphology resembling that of a microphase-separated diblock copolymer. When a second, higher intensity light source is rastered over the sample, the binary blend and the nanorods coassemble into regular, periodically ordered structures. In particular, the system displays an essentially defect-free lamellar morphology, with the nanorods localized in the energetically favorable domains. By varying the speed at which the secondary light is rastered over the sample, we can control the directional alignment of the rods within the blend. Our approach yields an effective route for achieving morphological control of both the polymeric components and nanoparticles, providing a means of tailoring the properties and ultimate performance of the composites.